3 years ago

X / -3 = 6 Pls solve.

Mathematics

1 answer:

soldier1979 [14.2K]3 years ago

7 0

Answer:

-18

Step-by-step explanation:

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$\sum_{n=3}^{20}(n(n+1))=\sum _{n=3}^{20} n^2+ \sum _{n=3}^{20} n$

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Given expression : $\sum_{n=3}^{20}(n(n+1))$

Solving further :

$\Rightarrow \sum_{n=3}^{20}(n^2+n)$

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